diff --git a/app/release/app-release-4.1.3c.apk b/app/release/app-release-4.1.3d.apk
similarity index 68%
rename from app/release/app-release-4.1.3c.apk
rename to app/release/app-release-4.1.3d.apk
index 74641b5..99e92d0 100644
Binary files a/app/release/app-release-4.1.3c.apk and b/app/release/app-release-4.1.3d.apk differ
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
index 5266c93..ec3af00 100644
--- a/app/src/main/AndroidManifest.xml
+++ b/app/src/main/AndroidManifest.xml
@@ -3,7 +3,7 @@
     xmlns:tools="http://schemas.android.com/tools"
     package="uk.org.openseizuredetector"
     android:versionCode="115"
-    android:versionName="4.1.3c">
+    android:versionName="4.1.3d">
     <!-- android:allowBackup="false" -->
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
diff --git a/app/src/main/java/uk/org/openseizuredetector/StartupActivity.java b/app/src/main/java/uk/org/openseizuredetector/StartupActivity.java
index 62a474a..ec18a8f 100644
--- a/app/src/main/java/uk/org/openseizuredetector/StartupActivity.java
+++ b/app/src/main/java/uk/org/openseizuredetector/StartupActivity.java
@@ -229,9 +229,14 @@ public class StartupActivity extends AppCompatActivity {
             Log.i(TAG, "Power Management OK - we are ignoring Battery Optimizations");
             mBatteryOptDialogDisplayed = false;
         } else {
-            Log.e(TAG, "Power Management Problem - not ignoring Battery Optimisations");
-            //mUtil.showToast("WARNING - Phone is Optimising OpenSeizureDetector Battery Usage - this is likely to prevent it working correctly when running on battery!");
-            if (!mBatteryOptDialogDisplayed) showBatteryOptimisationWarningDialog();
+            boolean preventBatteryOptWarning = SP.getBoolean("PreventBatteryOptWarning", false);
+            if (preventBatteryOptWarning) {
+                Log.i(TAG,"PreventBatteryOptWarning is true, so not displaying battery optimisation dialog");
+            } else {
+                Log.e(TAG, "Power Management Problem - not ignoring Battery Optimisations");
+                //mUtil.showToast("WARNING - Phone is Optimising OpenSeizureDetector Battery Usage - this is likely to prevent it working correctly when running on battery!");
+                if (!mBatteryOptDialogDisplayed) showBatteryOptimisationWarningDialog();
+            }
         }
 
 
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
index dbac5a2..564f041 100644
--- a/app/src/main/res/values/strings.xml
+++ b/app/src/main/res/values/strings.xml
@@ -364,7 +364,8 @@
     <string name="battery_usage_optimisation_dialog_text">
         <b>WARNING:  The Android System Battery Optimisation Settings are configured to \'Optimise\' OpenSeizureDetector.</b>\n\n
         This means it is likely to be shutdown when operating on battery power, so will not work correctly\n\n
-        Please go into the Phone Settings and select <b>Apps->OpenSeizureDetector->Battery->Optimise battery usage</b> and set it so that OpenSeizureDetector is NOT optimised</string>
+        Please go into the Phone Settings and select <b>Apps->OpenSeizureDetector->Battery->Optimise battery usage</b> and set it so
+        that OpenSeizureDetector is NOT optimised (on Older versions of Andoroid this option is in  </string>
     <string name="local_data">Local Data</string>
     <string name="shared_data">Shared Data</string>
     <string name="prune_database">Prune Database</string>
@@ -467,4 +468,6 @@
     <string name="notes_about_event">notes about event</string>
     <string name="SpO2">O2 Sat</string>
     <string name="data_sharing">Data Sharing</string>
+    <string name="prevent_bat_opt_summary">Do not display the battery optimisation dialog on start-up (some phones report that OpenSeizureDetector is optimised, even if it is not, so the dialog is a nuissance)</string>
+    <string name="prevent_bat_opt_title">Inhibit Battery Optimisation Warning Dialog</string>
 </resources>
diff --git a/app/src/main/res/xml/general_prefs.xml b/app/src/main/res/xml/general_prefs.xml
index 12fbcef..d8ae61a 100644
--- a/app/src/main/res/xml/general_prefs.xml
+++ b/app/src/main/res/xml/general_prefs.xml
@@ -69,6 +69,14 @@
         android:title="@string/auto_start_title"
         android:enabled="true"
         />
+
+    <CheckBoxPreference
+        android:defaultValue="false"
+        android:key="PreventBatteryOptWarning"
+        android:summary="@string/prevent_bat_opt_summary"
+        android:title="@string/prevent_bat_opt_title"
+        android:enabled="true"
+        />
     <Preference
         android:key="SelectBLEDevice"
         android:title="@string/select_ble_device_title"